Hello, i think i am infected, help pls

Hello, this is my first post and i registered for the sole purpose of seeking guidance and help from a community such as this one, so let me explain the problem now:

My computer is an actually good one, ive downloaded stuff and everything was fine, till 2 days ago, normally i dont turn off my computer, and its been like that for 2 days almost, but just tonight i noticed something was strange:

while trying to open any folder, or any program, i get a pop up message that says something like this:

Attention,User! Some Dangerous trojan horses detected on your computer. Microsoft Windows files corrupted. This may lead to the destruction of important files in C:/WINDOWS. Download protection software now!

Click OK to download the antispyware.(Recommended)

obviously i pressed cancel, and it opened a new tab on my firefox windows, some tab with the name spywareadvancedscanner.com or something like that.

any1 else had the same problem before? pls help i need to desinfect

 

hi and thank you very much for the response, this morning i went through all the steps to clean my computer, all the programs installed, i got rid of my problem after i finished malaware bytes ones, but i kept going just in case they missed something, here are the logs, pls tell me if there is still anything wrong

 

and the last one, the zip